The smartphone market, forecast to reach 700 million units by 2015, is expected to switch en masse to Bluetooth low energy technology, enabling these phones to become a hub for a multitude of other wireless devices.
Bluetooth is a proprietary open wireless technology standard for exchanging data over short distances (using short wavelength radio transmissions in the ISM band from 2400-2480 MHz) from fixed and mobile devices, creating personal area networks (PANs) with high levels of security. It was originally conceived as a wireless alternative to RS-232 data cables (An RS-232 port was once a standard feature of a PC for connections to modems, printers, mice, data storage, un-interruptible power supplies, and other peripheral devices.)Bluetooth can connect several devices, overcoming problems of synchronization.
Uses
Bluetooth is a standard wire-replacement communications protocol primarily designed for low power consumption, with a short range (power-class-dependent, but effective ranges vary in practice; see table below) based on low-cost transceiver microchips in each device Because the devices use a radio (broadcast) communications system, they do not have to be in visual line of sight of each other, however a quasi optical wireless path must be viable.
Class
Maximum permitted power
Range
(m)
(mW)
(dBm)
Class 1
100
20
~100
Class 2
2.5
4
~10
Class 3
1
0
~5
The effective range varies due to propagation conditions, material coverage, production sample variations, antenna configurations and battery conditions. In most cases the effective range of class 2 devices is extended if they connect to a class 1 transceiver, compared to a pure class 2 network. This is accomplished by the higher sensitivity and transmission power of Class 1 devices
Version
Data rate
Maximum application throughput
Version 1.2
1 Mbit/s
0.7 Mbit/s
Version 2.0 + EDR
3 Mbit/s
2.1 Mbit/s
Communication and connection
A master Bluetooth device can communicate with a maximum of seven devices in a piconet (an ad-hoc computer network using Bluetooth technology), though not all devices support this limit. The devices can switch roles, by agreement, and the slave can become the master (for example, a headset initiating a connection to a phone will necessarily begin as master, as initiator of the connection; but may subsequently prefer to be slave).
The smartphone market, forecast to reach 700 million units by 2015, is expected to switch en masse to Bluetooth low energy technology, enabling these phones to become a hub for a multitude of other wireless devices.
Bluetooth is a proprietary open wireless technology standard for exchanging data over short distances (using short wavelength radio transmissions in the ISM band from 2400-2480 MHz) from fixed and mobile devices, creating personal area networks (PANs) with high levels of security. It was originally conceived as a wireless alternative to RS-232 data cables (An RS-232 port was once a standard feature of a PC for connections to modems, printers, mice, data storage, un-interruptible power supplies, and other peripheral devices.)Bluetooth can connect several devices, overcoming problems of synchronization.
Uses
Bluetooth is a standard wire-replacement communications protocol primarily designed for low power consumption, with a short range (power-class-dependent, but effective ranges vary in practice; see table below) based on low-cost transceiver microchips in each device Because the devices use a radio (broadcast) communications system, they do not have to be in visual line of sight of each other, however a quasi optical wireless path must be viable.(m)
Communication and connection
A master Bluetooth device can communicate with a maximum of seven devices in a piconet (an ad-hoc computer network using Bluetooth technology), though not all devices support this limit. The devices can switch roles, by agreement, and the slave can become the master (for example, a headset initiating a connection to a phone will necessarily begin as master, as initiator of the connection; but may subsequently prefer to be slave).Video Explaining how Bluetooth works:
http://videos.howstuffworks.com/techstuff/23013-how-bluetooth-works-video.htm